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we add the following DIMM card in our DELL server ( 16G memory ) , OS is RHEL 7.6 version

as we can see the speed is - 2400MHz

but the - Configured Clock Speed: is only 1866MHz

so I guess that value as - 1866MHz , is because we set the DIMM card in socket that maybe limited the speed ?

so regarding to that we have few Question's:

  1. what are the consequences when memory speed is lowest then what DIMM card can work with 2400MHz is it something that have meaning about read/write to memory RAM? / else?
  2. the 1866MHz that we get , is only because DIMMs combination on socket?
  3. how to get the max 2400MHz ? what is the right approach about DIMM's location ?

here the results from dmidecode

Server is Dell PowerEdge R730 and memories are:

Memory Device
    Array Handle: 0x1000
    Error Information Handle: Not Provided
    Total Width: 72 bits
    Data Width: 64 bits
    Size: 16384 MB
    Form Factor: DIMM
    Set: 3
    Locator: A9
    Bank Locator: Not Specified
    Type: DDR4
    Type Detail: Synchronous Registered (Buffered)
    Speed: 2400 MHz
    Manufacturer: 002C0632002C
    Serial Number: 1B42681B
    Asset Tag: 001808A0
    Part Number: 18ASF2G72PDZ-2G3D1
    Rank: 2
    Configured Clock Speed: 1866 MHz
    Minimum Voltage:  1.2 V
    Maximum Voltage:  1.2 V
    Configured Voltage:  1.2 V

from DELL HW document we can see that

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King David
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1 Answers1

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is because we set the DIMM card in socket that maybe limited the speed ?

Yes

what are the consequences when memory speed is lowest then what DIMM card can work with 2400MHz is it something that have meaning about read/write to memory RAM? / else?

The only difference is performance, it's not going as fast as it could.

the 1866MHz that we get , is only because DIMMs combination on socket?

Very possibly but without knowing the FULL spec of your memory layout we can't say, but...

how to get the max 2400MHz ? what is the right approach about DIMM's location ?

This is a very useful guide to how to lay out your memory and what speeds you'll get as you fill the slots - Clicky

Chopper3
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  • I not sure about but I need to ask , according to the doc we can see that we have 3 speed , so if for example we used the first and second socket then we get - 2133 , but if we also used the 3 socket , then we get - 1866? am I correct here ? – King David Sep 01 '22 at 09:39
  • Every server has a 'fill order' - which slots to use first, follow that guide and you'll get the best performance with the DIMMs you have. – Chopper3 Sep 01 '22 at 10:49